Improvement in core-boxes and cores



`the auxiliary core.

NrED .STATES rWILLIAM A.` OOGSWELL, OF ROCHESTER, NEW YORK, ASSIGNOR TOJ UNIUS JUDsoN, or SAME PLACE.

Specification formingpart of Letters Patent No. 154,747, 'datedSeptember 8, 1874; application filed l ,I December El, 1873.

OASE

To aZZ whom it may concern:

Be it known that I, WILLIAM A. GoGrsWELL, of the city of Rochester, inthe county of Monroe and State of New York, have invented a certain newand useful Improvement in Core-Boxes and in the Construction of Cores;and I do hereby declare that the following is a full, clear, and exactdescription of the construction and operation of the same.

My invention consists of a core-box of peculiar construction for formingthe cores used in casting the globular casings of steam`governor-valves, and also in a novel construction of cores, ashereinafter described.

In the drawings, Sheet 1 represents the core-box, and Sheet 2 the core.Figure l is a plan of the main box.' zFigs. 2 and 3 are lon gitudinaland cross-sections of the same. Fig. 4 is a plan of the auxiliary box.Fig. 5 is a cross-section of the same. Fig. 6 is an elevation ofone-half` of the main core. Fig. 7 isa similar view of vthe auxiliarycore. Figs. 8 and 9 are an elevation and cross-section, respectively, ofthe complete core.

This core is intended for casting 4the interior of -globulargovernor-valve casings, in which a jacket is 'used to allow the steampassing through the upper seat to return to the bottom of the casing, tounite with the current passing through the lower seat before enteringthev steam-chest.l

B B are the counterparts or halves constituting the main core. The innerfaces of these parts iit closely together, and the exterior is formedwith a lcentral globe, h, which forms the enlarged globular space in thecenter of the shell. Above and below the globe are cylindricalprojections Z fi, which form the openings in the upper and lower ends ofthe shell. A central opening, k, is made in one side ofthe globe, whichextends inward halfway, more or less, thus 4leavin g the closed portionof the globe of about an equal extent in cross section. Half-sockets Z Zare formed in the inner faces of-the counterparts, above and below theopening k, to receive the prints of C C are the counterparts or halvesof the auxiliary core. Their at inner surfaces also t together; and theouter surface consists of a cylindrical projection, m, which forms theinlet-pipe of the casing 5 a body, fn', with a circular projecting rim,n1, at the rear, and offsets n2 n2 at the sides, which form the interiorshell and jacket of the casing; hubs or projections pp, which form theopenings of the seats in the casing; and coreprints r r, which rest inthe halfsockets Z Z of the main core.

The construction is such that when the cores are litted together andplaced in the mold the molten iron poured in the latter will flow intothe space s, Fig. 9, and form the jacket of the casing, and also intothe spaces t t, above and below the body of the auxiliary core, and formthe webs which contain the valve-seats.

The counterparts of the main core are both formed in a single core-box,D, having a chan geable center-piece, E. The depression in the box is ofthe same outline as the half-core e, being the globular portion, and j jthe cylindrical end portions. The center -piece E is changeable from oneside to the other by means of arms q q attached thereto, and fitting inmortises e c on opposite sides. The top of the box and of thecenter-piece is plane, to allow smoothing off. The front and under sideof the center-piece is provided with a segment-face, w, whose diameteris as much less than the diameter of the depression e as the thicknessof the side of the globe h of the core which it forms. In the rear ofthis segment is an oi'set, u, which projects downward to the bottom ofthe cavity, and in the rear of this is a circular bearing, which iillsthe whole rear of the cavity. On each side of the center-piece areprints y y.

The operation is as follows: The centerpiece being fitted in place, thesand is lled into the depression, and around the centerpiece. The spacebetween the segment w and the front of the cavity e forms the thicknessh. The bearing forms the opening k, and the prints y y form thehalf-sockets Z Z of the core. vThe sweeping 0E of the sand level withthe top of the box forms the at inner sur- PATENT OFFICE.

face of the core. To form the opposite counterpart, B, the center-pieceis simply shifted to the opposite position, as before described.

The counterparts of the auxiliary core are both formed in a single box,Gr, as shown in Figs. 4 and 5. This box is a counterpart of the haltcorebefore described, consisting of cavities b cf a, corresponding with thestem m, body nJ nl n2, projections p p, and prints 1' 1.

The main core-box may bel adapted to form cores for valves having thesteam pass hori' zontally, by forming right-angled cavitiespon oppositesides of the globular center, for an extension of the core. rEhecenter-piece E will cut of one of these cavities when not in use.

What I claim as new is- 1. The combination, with the box I), of thecenter-piece E, provided with the segment w and bearing w, and madechangeable in position trom one side to the other, for forming thecounterparts B B of the main core, as shown and described.

2. Acore for casting the interior of valvecasings, consisting of themain counterparts Witnesses.

WM. A. COGSWELL. .h Witnesses:

RJ?. Oscoop, E. B. Soo'rcr.

